How to handle image/gif type response on client side using GWT
- by user200340
Hi all,
I have a question about how to handle image/gif type response on client side, any suggestion will be great.
There is a service which responds for retrieving image (only one each time at the moment) from database. The code is something like,
JDBC Connection
Construct MYSQL query.
Execute query
If has ResultSet, retrieve first one {
//save image into Blob image, “img” is the only entity in the image table.
image = rs.getBlob("img");
}
response.setContentType("image/gif"); //set response type
InputStream in = image.getBinaryStream(); //output Blob image to InputStream
int bufferSize = 1024; //buffer size
byte[] buffer = new byte[bufferSize]; //initial buffer
int length =0;
//read length data from inputstream and store into buffer
while ((length = in.read(buffer)) != -1) {
out.write(buffer, 0, length); //write into ServletOutputStream
}
in.close();
out.flush(); //write out
The code on client side
....
imgform.setAction(GWT.getModuleBaseURL() + "serviceexample/ImgRetrieve");
....
ClickListener {
OnClick, then imgform.submit();
}
formHandler {
onSubmit, form validation
onSubmitComplete
??????? //handle response, and display image
**Here is my question, i had tried
Image img = new Image(GWT.getHostPageBaseURL() +"serviceexample/ImgRetrieve");
mg.setSize("300", "300");
imgpanel.add(img);
but i only got a non-displayed image with 300X300 size.**
}
So, how should i handle the responde in this case?
Thanks,
